/usr/share/qt4/bin/lupdate is in qt4-linguist-tools 4:4.8.7+dfsg-11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/qt4/bin/../../../lib/x86_64-linux-gnu/qt4/bin/lupdate
/usr/share/qt4/bin/../../../lib/x86_64-linux-gnu/qt4/bin/lupdate